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Wide Input-Voltage Range Boost Three-Level DC–DC Converter With Quasi-Z Source for Fuel Cell Vehicles

Zhang, Yun; Shi, Jilong; Zhou, Lei; Li, Jing; Sumner, Mark; Wang, Ping; Xia, Changliang


Yun Zhang

Jilong Shi

Lei Zhou

Jing Li

Professor of Electrical Energy Systems

Ping Wang

Changliang Xia


© 1986-2012 IEEE. To solve the problem of the mismatched voltage levels between the dynamic lower voltage of the fuel cell stack and the required constant higher voltage (400 V) of the dc-link bus of the inverter for fuel cell vehicles, a boost three-level DC-DC converter with a diode rectification quasi-Z source (BTL-DRqZ) is presented in this paper, based on the conventional flying-capacitor boost three-level DC-DC converter. The operating principle of a wide range voltage-gain for this topology is discussed according to the effective switching states of the converter and the multiloop energy communication characteristic of the DRqZ source. The relationship between the quasi-Z source net capacitor voltages, the modulation index, and the output voltage is deduced and then the static and dynamic self-balance principle of the flying-capacitor voltage is presented. Furthermore, a boost three-level DC-DC converter with a synchronous rectification quasi-Z source (BTL-SRqZ) is additionally proposed to improve the conversion efficiency. Finally, a scale-down 1.2 kW BTL-SRqZ prototype has been created, and the maximum efficiency is improved up to 95.66% by using synchronous rectification. The experimental results validate the feasibility of the proposed topology and the correctness of its operating principles. It is suitable for the fuel cell vehicles.


Zhang, Y., Shi, J., Zhou, L., Li, J., Sumner, M., Wang, P., & Xia, C. (2017). Wide Input-Voltage Range Boost Three-Level DC–DC Converter With Quasi-Z Source for Fuel Cell Vehicles. IEEE Transactions on Power Electronics, 32(9), 6728-6738.

Journal Article Type Article
Acceptance Date Nov 1, 2016
Online Publication Date Nov 4, 2016
Publication Date 2017-09
Deposit Date Jul 7, 2017
Publicly Available Date Jul 7, 2017
Journal IEEE Transactions on Power Electronics
Print ISSN 0885-8993
Electronic ISSN 1941-0107
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 32
Issue 9
Pages 6728-6738
Keywords Boost three-level DC-DC converter, fuel cell vehicles, Quasi-Z source, synchronous rectification, wide range of voltage-gain.
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Additional Information 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works


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